Template-Type: ReDIF-Article 1.0 Author-Name: M. Millers Author-Workplace-Name: Faculty of Forestry, Latvian University of Agriculture, Latvia Title: The proportion of heartwood in conifer (Pinus sylvestris L., Picea abies [L.] H. Karst.) trunks and its influence on trunk wood moisture - Abstract: As the tree age increases, the formation of heartwood takes place in the central part of the tree. Since there is a large difference in the moisture content between sapwood and heartwood in conifers, the proportion of heartwood expressed in percentage is one of the most important factors influencing the average moisture of trunk wood. The aim of the research was to find out the changes in parameters of heartwood proportion and the changes in average trunk wood moisture parameters, depending on the age of the tree. To evaluate and compare the heartwood proportion in pine and spruce trunk and its moisture, sample plots were established throughout the territory of Latvia in 2011. These sample plots were established in stands of different ages (37-143 years). The total number of sample plots was 61-29 for pines with 246 sample trees and 32 sample plots for spruces with 270 sample trees. With the increase in the tree age from 60 to 140 years, the heartwood proportion increases and the average moisture content of trunk wood decreases. With an increase of the heartwood proportion in pine from 18% to 39%, the average moisture of trunk wood decreases from 108% to 86%, but with an increase of the heartwood proportion in spruce from 30% to 49%, the average moisture content of trunk wood decreases from 107% to 81%. Keywords: pine, spruce, heartwood, moisture content of wood Journal: Journal of Forest Science Pages: 295-300 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/29/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/29/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201308-0001.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:29-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Macků Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: J. Dvořák Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: A comparative analysis of neck muscle tension in a harvester operator compared with chainsaw and horse skidding operator and with normal human activities Abstract: The goal of the experiment was to assess the physical stress experienced by an operator during the use of harvester equipment. Experimental data was obtained from field measurements with a Biofeedback 2000x-pert (BFB) unit, which allows recording of selected physiological parameters on the operator, especially an electromyogram of target muscle groups, body temperature, breathing rate and pulse. Experimental data was interpreted by comparing it with values measured during normal human activities. Measurements were done during logging using a harvester, a chainsaw, while skidding with a horse, while running, and while walking normally. The results of the experiment showed that the electromyograph (EMG) of the investigated muscle groups exhibited values 164% higher during running than during the cut-to-length (CTL) production, up to 77% higher while walking, up to 28% higher during logging with a chainsaw, and even up to 230% higher values while skidding with a horse. Body temperature and pulse measurements did not show a significant difference in values measured during CTL production and during other activities. Keywords: biometric data, fatigue, harvester equipment, stress Journal: Journal of Forest Science Pages: 301-305 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/5/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/5/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201308-0002.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:5-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: I. Kuneš Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: M. Baláš Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: V. Balcar Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Research Station Opočno, Opočno, Czech Republic Author-Name: D. Kacálek Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Research Station Opočno, Opočno, Czech Republic Author-Name: K. Millerová Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: A. Jančová Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: O. Nováková Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: O. Špulák Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Research Station Opočno, Opočno, Czech Republic Author-Name: D. Zahradník Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: J. Vítámvás Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: T. Koňasová Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Effects of fertilisation on growth and nutrition of Norway spruce on a harsh mountain site Abstract: We evaluated the potential of crushed amphibolite and artificial slow-release N-P-K-Mg fertiliser to stimulate the survival, growth and nutrition of Norway spruce planted on an acidified air-polluted mountain site. Control plots and treatments with slow-release fertiliser (SRF) and amphibolite (AMT) were installed. In the SRF, forty grams of tabletted amendment were applied in the close vicinity of the trees. In the AMT, two kilograms of amendment were incorporated into the soil inside the planting hole of each tree at planting. The SRF application resulted in a significant growth stimulation of spruces. The growth stimulation by amphibolite was perceptible but not significant; this amendment, however, significantly reduced mortality. None of the amendments induced marked changes in foliar nutrient concentrations. Keywords: fertilization, nutritional status, Picea abies, survival Journal: Journal of Forest Science Pages: 306-318 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/6988-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/6988-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201308-0003.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:6988-JFS Template-Type: ReDIF-Article 1.0 Author-Name: T. Misik Author-Workplace-Name: Department of Environment Science, Eszterházy Karoly College, Eger, Hungary Author-Name: K. Varga Author-Workplace-Name: Department of Ecology, University of Debrecen, Debrecen, Hungary Author-Name: Zs. Veres Author-Workplace-Name: Department of Ecology, University of Debrecen, Debrecen, Hungary Author-Name: I. Kárász Author-Workplace-Name: Department of Environment Science, Eszterházy Karoly College, Eger, Hungary Author-Name: B. Tóthmérész Author-Workplace-Name: Department of Environment Science, Eszterházy Karoly College, Eger, Hungary Title: Long-term response of understorey cover, basal area and diversity to stand density in a mixed oak forest on the Síkfőkút plot in Hungary Abstract: The serious oak decline was reported for the 1979-80 period and 63.0% of adult oaks died in a mixed oak forest in the Síkfőkút site, Hungary. The data were used to obtain (1) quantitative information on diversity indices of shrub layer and shrub canopy, including foliage cover percentage of the shrub layer, mean cover of shrub species before and after the oak decline and (2) structural information on shrub basal area and shrub foliage arrangement. Since 1972 we have determined diversity indices, cover percentage and basal area of shrubby vegetation on the monitoring and plus plots. A negative relation was detected between Shannon-Wiener and Evenness indices of the shrub layer and living oak tree density. A positive relation was confirmed between basal area and mean cover of dominant woody species (Acer campestre, Acer tataricum and Cornus mas). The mean cover of shrub species except of A. campestre increased non-significantly after the oak decline on the 48 m × 48 m plot. The findings of the study indicate that diversity indices of the shrub layer and mean cover of A. campestre can be used as a principal indicator of natural disturbance in the studied mature stand and the species of the shrub layer respond differently to the decreasing stand density. Keywords: Quercus cerris, shrub layer, Acer campestre, Shannon-Wiener index, Evenness index, shrub foliage cover Journal: Journal of Forest Science Pages: 319-327 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/15/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/15/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201308-0004.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:15-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: H. Attis Beltrán Author-Workplace-Name: Universidad Nacional del Comahue (UNCo), San Martin de los Andes, Neuquén, Argentina Author-Name: G. Martínez Pastur Author-Workplace-Name: Centro Austral de Investigaciones Científicas (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina Author-Name: H. Ivancich Author-Workplace-Name: Centro Austral de Investigaciones Científicas (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina Author-Name: M.V. Lencinas Author-Workplace-Name: Centro Austral de Investigaciones Científicas (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina Author-Name: L.M. Chauchard Author-Workplace-Name: Universidad Nacional del Comahue (UNCo), San Martin de los Andes, Neuquén, Argentina Author-Workplace-Name: Administración de Parques Nacionales, San Martín de los Andes, Neuquén, Argentina Title: Tree health influences diameter growth along site quality, crown class and age gradients in Nothofagus forests of southern Patagonia Abstract: We examined the influence of tree health on annual diameter increment of trees along gradients in stand site quality, crown classes and tree age in Nothofagus pumilio forests of Southern Patagonia. Healthy trees had higher annual diameter increment than unhealthy trees along all gradients (site quality, crown class, tree age). We argue that tree health could be employed as a qualitative variable in models of tree growth to estimate aboveground biomass and carbon stocks in this forest system. Keywords: Nothofagus pumilio, annual diameter increment Journal: Journal of Forest Science Pages: 328-336 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/30/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/30/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201308-0005.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:30-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Václav Tlapák Title: Prof. Ing. Jaroslav Herynek, CSc., is celebrating his 80th birthday Journal: Journal of Forest Science Pages: 337 Volume: 59 Issue: 8 Year: 2013 DOI: 10.17221/6991-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/6991-JFS.html File-Format: text/html Handle: RePEc:caa:jnljfs:v:59:y:2013:i:8:id:6991-JFS